-- Arithmetic Operators
local A = 10
local B = 20

print(A + B)
print(A - B)
print(A * B)
print(A / B)
print(B % A)
print(A ^ 2)
print(-A)

-- 关系运算符 Relational Operators

--[[
    ==	Checks if the value of two operands are equal or not, if yes then condition becomes true.	(A == B) is not true.
    ~=	Checks if the value of two operands are equal or not, if values are not equal then condition becomes true.	(A ~= B) is true.
    >	Checks if the value of left operand is greater than the value of right operand, if yes then condition becomes true.	(A > B) is not true.
    <	Checks if the value of left operand is less than the value of right operand, if yes then condition becomes true.	(A < B) is true.
    >=	Checks if the value of left operand is greater than or equal to the value of right operand, if yes then condition becomes true.	(A >= B) is not true.
    <=	Checks if the value of left operand is less than or equal to the value of right operand, if yes then condition becomes true.	(A <= B) is true.]]


-- Logical Operators
--[[
    and	Called Logical AND operator. If both the operands are non zero then condition becomes true.	(A and B) is false.
    or	Called Logical OR Operator. If any of the two operands is non zero then condition becomes true.	(A or B) is true.
    not	Called Logical NOT Operator. Use to reverses the logical state of its operand. If a condition is true then Logical NOT operator will make false.	!(A and B) is true.
]]
-- Misc Operators 杂项运算符
--[[
    .. concatenation
    # length
    ]]

local str1 = "Hello"
local str2 = "World"

local str = str1 .. str2
print(str)
print("length of str:", #str)
